下列各项不属于合同法基本原则的是( )。A．合同自愿原则 B．诚实信用原则 C．平

圆形建筑物施工复杂，施工费用一般比矩形建筑增加（）。

A．10%～20%

B．30%～50%

C．20%～40%

D．20%～30%

弹簧振子以O点为平衡位置在B、C两点之间做简谐运动．B、C相距20cm．某时刻振子处于B点．经过0.5s，振子首次到达C点．求：

（1）振动的周期和频率；

（2）振子在5s内通过的路程及位移大小；

（3）振子在B点的加速度大小跟它距O点4cm处P点的加速度大小的比值．

Looking back on my childhood, I am convinced that naturalists are born and not made. Although we were all brought up in the same way, my brothers and sisters soon left their pressed flowers and insects. Unlike them, I had no ear for music and languages. I was not an early reader and I could not do mental arithmetic.

Before World War I we spent our summer holidays in Hungary. I have only the dim(模糊的) memory of the house we lived in, of my room and my toys. Nor do I recall clearly the large family of grandparents, aunts, uncles and cousins who gathered next door. But I do have a clear memory of the dogs, the farm animals, the local birds, and above all, the insects.

I am a naturalist, not a scientist. I have a strong love of the natural world and my enthusiasm had led me into varied investigations（调查研究）. I love discussing my favorite topics and enjoy burning the midnight oil reading about other people’s observations and discoveries. Then something happens that brings these observations together in my conscious（清醒的） mind. Suddenly you fancy you see the answer to the riddle, because it all seems to fit together. This has resulted in my publishing 300 papers and books, which some might honor with the title of scientific research.

But curiosity, keen（敏锐的） eyes, a good memory and enjoyment of the animal and plant world do not make a scientist: one of the excellent and essential qualities required is self-discipline, a quality I lack. A scientist, up to a certain point, can be made. A naturalist is born. If you can combine the two, you get the best of both worlds.

小题1:The first paragraph tells us the author ______.

A．was interested in flowers and insects in his childhood

B．lost his hearing when he was a child

C．didn’t like his brothers and sisters

D．was born into a naturalist’s family小题2:The author can’t remember his relatives clearly because _______.

A．he didn’t live very long with them

B．the family was extremely large

C．he was too young when he lived with them

D．he was fully occupied with observing nature小题3:It can be inferred from the passage that the author was _______.

A．a scientist as well as a naturalist

B．a naturalist but not a scientist

C．no more than a born naturalist

D．first of all a scientist小题4: The author says that he is a naturalist rather than a scientist probably because he thinks he _______.

A．has a great deal of trouble doing mental arithmetic

B．lacks some of the qualities required of a scientist

C．just reads about other people’s observations and discoveries

D．comes up with solutions in a most natural way

在施工组织设计技术经济分析中，决策是根据( )提出的。

A．施工方案分析

B．施工进度计划分析

C．施工平面图分析

D．综合技术经济分析

甲国居民A有来源于乙国所得120万元，来源于两国所得80万元，甲、乙、丙三国的所得税税率分别为40%、30%、50%。

在综合抵免法下，甲国应对上述所得征收所得税税额为( )。

A．12万元

B．8万元

C．4万元

D．0